January 2010
Intermediate to advanced
479 pages
11h 5m
English
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Chapter 8. Group Chatting: A Multi-User Chat Client
WHAT'S IN THIS CHAPTER?
Joining group chat rooms
Creating and configuring rooms
Exchanging presence and messages in group chat
Multi-user chat roles and permissions
Moderating rooms
XMPP's multi-user chat extension was originally inspired by the Internet Relay Chat (IRC) protocol. Some clever XMPP protocol designers wanted to improve upon IRC in several ways, while at the same time bringing group chat natively to XMPP.
XMPP's multi-user chat (MUC) has one enormous advantage over its predecessors — structured payloads. IRC and other chat protocols typically transmit plain text back and forth with very little structure. Because of XMPP's extensibility, MUC messages can carry arbitrarily complex payloads even within regular chat messages.
MUC is also a form of message broadcast. A single message sent to a room gets rebroadcast out to all the participants automatically. This makes it similar to Publish-Subscribe, which you see in the next chapter. Unlike Publish-Subscribe, MUC provides a lot of advanced management features typical of group chat services, such as room moderation, and each participant is often allowed to broadcast messages to the room as well.
The combination of structured messaging, automatic broadcast, and group publishing opens the doors to many alternative uses of MUC. It has been used as the basis for rich, collaborative spaces (for example, Drop.io, which was shown in Chapter 2), and in Chapter 11, you build a multi-user ...
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